Northern Tier may refer to:
Northern Tier (Pennsylvania), five northern counties in Pennsylvania Northern Tier (United States), the northernmost confine of the lower 48 United States Northern Tier (Scouting), high adventure bases run by Scouting America Northern Tier Energy, an American business partnership created in 2010 Northern Tier, a Cold War term from 1955–1979 for the four Middle Eastern members of the Baghdad Pact, also known as the Central Treaty Organization: Turkey, Iraq, Iran and Pakistan.